Beyond APY: Saying Goodbye to Black Box Trust and Reassessing the Security Logic of ETH Staking

Staking rewards are just the result; who holds the withdrawal keys, how validators operate, and whether ETH relies on additional smart contracts and liquidity structures are more important.

Written by: imToken

In recent times, security incidents in the Crypto industry have been almost non-stop (see also "From Binance to PHP2Shell: In the AI Era, the Defense Line of Web Security Needs Redefining").

From exchanges losing billions of dollars to wallet supply chains and third-party service providers being attacked, to smart contract vulnerabilities and on-chain assets being stolen, a series of events repeatedly remind us: In the Crypto world, asset security does not only depend on whether the underlying blockchain is reliable, but also on who holds the assets, who controls the keys, and how many trust links exist in the entire service chain.

This is equally true for ETH holders participating in staking.

Ethereum has established a relatively mature native staking mechanism, allowing users to stake ETH to become network validators, earning protocol rewards while maintaining network security. However, as staking gradually develops into various participation methods such as exchange custody, liquid staking, and professional node services, an easily overlooked issue arises:

Despite staking ETH, the asset control rights and security boundaries behind different schemes may be completely different.

If ETH is entrusted to a third party, who actually has the withdrawal rights? If a professional service provider operates the validator, can users still control their principal? And what potential risks arise between native staking and liquid staking?

Clarifying these issues may be more important than simply comparing the APY of different staking products.

1. The First Line of Defense for Staking Security: Who Holds the Asset Withdrawal Rights?

To understand the security mechanism of ETH staking, it is essential to clarify who controls the Ethereum validator nodes.

Ethereum uses a Proof of Stake (PoS) consensus mechanism, where users deposit at least 32 ETH into a deposit contract to activate a validator node, participating in block proposals, transaction validation, and consensus proof, earning rewards according to network rules.

However, a validator node is not governed by a single key. In the Ethereum staking system, core permissions are divided into two categories:

• Signing Key: Used for the daily operation of the validator node, including submitting block proposals and validating proofs, representing the operational authority to participate in network consensus;
• Withdrawal Key: Used to control the ownership of the staked principal and rewards, determining which designated address (usually directly bound to the user's self-custody wallet address) the funds can ultimately be returned to, representing the final control over the assets;

The responsibilities of the two are very clear: the signing key determines whether the validator can operate normally, while the withdrawal key determines who can ultimately withdraw the money. This means that the person responsible for operating the validator does not necessarily need to have the final control over the assets.

Understanding this division of permissions allows us to see the essential differences between custodial and non-custodial models:

• In fully custodial staking, both types of permissions are often concentrated in the platform's hands. Users deposit ETH into an exchange or custody institution, where the platform is responsible for node operation and also controls the withdrawal rights. What users see on the front end is just a string of account balances, and whether the assets can be smoothly redeemed is directly subject to the platform's own fund management, withdrawal rules, and operational status;
• In non-custodial staking models, the two types of permissions are physically separated. Users control the withdrawal rights through their own wallets, while professional service providers only hold the signing key and are responsible for the daily operation and maintenance of the node. Even if the service provider takes over the cumbersome hardware and network maintenance, they cannot transfer the user's staked principal with their operational authority;

This design of "withdrawal rights belong to users, operational rights belong to service providers" minimizes the trust boundary—users do not need to relinquish control over their principal and do not need to bear the high costs of node operation alone.

Of course, non-custodial does not mean zero risk.

The signing key still concerns the daily performance of the validator. If the service provider experiences key leakage, double signing, or severe downtime, the validator may still face penalties at the protocol level.

Therefore, the first step in evaluating a staking solution is to see whether it strictly isolates withdrawal rights from operational rights and whether users truly hold the keys to retrieve their assets.

2. How Does the Ethereum Native Protocol Protect Staked Assets?

Understanding key control rights leads to another key question: why is directly participating in Ethereum native staking clearly superior in security structure to various third-party derivative staking products?

The core reason is that ETH native staking is directly built on the underlying consensus protocol of Ethereum, without the need to add additional intermediate layers.

When users participate in native staking, ETH directly enters the official Ethereum validator system, and the distribution of rewards and penalties for violations is entirely executed automatically by the underlying protocol code.

It does not rely on any third-party fund pool to aggregate assets, nor does it need to mint a derivative token (such as LST) to indirectly map staking rights, thereby fundamentally eliminating the composite risks brought by third-party protocol contracts, cross-layer governance, and derivative disconnection.

As of now, within the native protocol, Ethereum has also established clear security and exit boundaries through three mechanisms.

First, the protocol constrains validator behavior through rewards and penalties.

Validators must remain online continuously and submit block proposals and validation proofs as required. If a node fails or goes offline for an extended period, it may miss rewards and face corresponding balance penalties.

If a validator engages in more serious violations, such as signing conflicting blocks, it may trigger Slashing (penalty mechanism), resulting in the destruction of part of the staked ETH, and the validator will be forcibly exited from the network.

The purpose of this mechanism is to ensure that participants must bear corresponding responsibilities while earning staking rewards, making any attempt to undermine network consensus incur real economic costs.

Second, withdrawal rights and validator operational rights can be independent of each other.

This is a very important design for asset security in native staking. Even if there is an issue with the validator's signing key, as long as the withdrawal key is still securely held by the user, attackers cannot simply use the signing key to withdraw the user's staked principal.

After the Pectra upgrade, Ethereum further improved this mechanism, allowing the withdrawal address to directly initiate validator exit operations, no longer fully relying on the validator's signing key, which provides non-custodial users with a fundamental guarantee of "forced withdrawal of funds" in extreme situations.

Finally, the exit of native staking is also constrained by protocol rules.

Native staking supports reward extraction and complete withdrawal of principal, but it does not arrive instantly like a regular wallet transfer. After a validator initiates an exit, it must enter the global exit queue according to protocol rules (the queue time depends on the number of validators exiting simultaneously across the network), and only after completion will the principal and remaining rewards be automatically settled to the bound withdrawal address (see also "Why Do You Have to Queue for a Month to Participate in Ethereum Native Staking Now?").

From this perspective, the value of native staking lies not only in earning ETH rewards but also in providing a set of rules that are completely public, transparently verifiable on-chain, and do not rely on any centralized institution for settlement.

3. Comparing Four Mainstream Schemes: Where Are the Security Boundaries of Different Staking Models?

Combining "key control rights" and "protocol dependency", the four main types of ETH staking schemes currently on the market essentially place risks in different baskets.

1. Fully Custodial Staking (Centralized Exchanges / Custody Institutions)

The staking services provided by exchanges and custody institutions usually have the lowest participation threshold, support small amounts of staking, and the operational experience is similar to traditional financial management, where users do not have to deal with complex technical operations.

However, at the same time, the control over the principal is completely relinquished to the platform. Even if the underlying ETH ultimately enters the official Ethereum staking contract, users still need to bear the platform's credit risk, internal risk control risk, and withdrawal restrictions in extreme market conditions.

2. Liquid Staking (Represented by Lido and Other LST Protocols)

Taking Lido and other liquid staking protocols as an example, after users deposit ETH, they can receive LST representing staking rights, such as stETH, which facilitates secondary earnings in DeFi or immediate liquidity in the secondary market.

The biggest advantage of this type of scheme is that it lowers the participation threshold and allows users to participate in other applications like DeFi during the staking period, but the risk level significantly increases. Holding LST does not equate to having withdrawal rights from the validator but rather holding a debt certificate based on smart contracts.

In addition to the underlying node penalty risks, users also need to bear smart contract vulnerability risks, protocol governance risks, and extreme market conditions leading to LST secondary market discounts (disconnection) and redemption runs—this has already occurred multiple times in LST's history.

3. Non-Custodial Native Staking (Self-Held Withdrawal Rights + Professional Node Operation)

Non-custodial native staking aims to resolve the contradiction between asset autonomy and node operation.

Users participate in the network through the Ethereum native staking mechanism, holding the withdrawal key themselves, while professional service providers are responsible for the operation, monitoring, and maintenance of the validator. This does not require users to bear the disconnection risks of liquid staking tokens and reduces the additional risks brought by third-party staking pool smart contracts and governance mechanisms.

4. Independent Staking (Solo Staking)

If users have sufficient ETH and technical ability, they can also set up their own validator nodes. In this case, the signing key, withdrawal key, and node equipment are all managed by the user without relying on third-party node service providers.

However, this does not mean the risks are the lowest—node hardware failures, network interruptions, client configuration errors, improper key backups, and even double signing can lead to loss of rewards or penalties. Therefore, for ordinary users without long-term node operation experience, technical and maintenance costs are also a barrier.

In summary, the security differences among several models can be summarized as:

In conclusion, different staking models address different needs for capital volume and risk preferences. For users who value absolute control over their principal but do not wish to expend effort maintaining servers, "non-custodial native staking" is undoubtedly a more suitable security solution.

In practical implementation, this scheme also offers two modes of compounding validator nodes and automatic withdrawal validator nodes, allowing users to flexibly choose different capital management methods:

• Compounding Validator Nodes: All rewards generated from staking will automatically remain in the validator's balance for reinvestment, enhancing long-term capital compounding efficiency (the effective staking limit for a single validator node can be expanded up to 2048 ETH);
• Automatic Withdrawal Validator Nodes: The effective balance of the validator node is maintained at 32 ETH, and the excess consensus layer staking rewards will be periodically and automatically returned to the user's withdrawal address by the Ethereum protocol without manual claims, suitable for users with periodic cash flow needs;

Of course, choosing a non-custodial model does not mean one can be a "hands-off manager". Since the final control over the assets is entirely in the user's hands, they still need to fulfill their personal security responsibilities—properly offline backup their wallet mnemonic, carefully verify the withdrawal address before initiating staking, and maintain a clear understanding of the Ethereum protocol's exit queue mechanism, service fee rates, and potential underlying penalty rules.

Final Thoughts

As more and more ETH enters long-term earning systems, as holders, what we truly need to focus on may not only be how much yield our assets can generate, but whether we still hold the ultimate initiative to retrieve our principal when any external service link encounters extreme situations.

Keeping the final control over assets in our own hands while letting professionals handle professional matters.

This may be the most noteworthy security value of non-custodial native staking.